four walls and a sturdy foundation. But if that sort of conventionality bores you, there are plenty of other options — from a yurt to a houseboat! Check out these unusual homes and tell us, would you ever move there?

Would you ever live in a lighthouse? The Smith Point Lighthouse is a caisson lighthouse in Chesapeake Bay and is listed in the National Register of Historic Places. It also happens to be for sale! Its interior has a 19th-century nautical charm, but with modern amenities. And great water views in every direction!

In the 1950s, architect Buckminster Fuller popularized the geodesic dome, a spherical structure composed small circles that intersect to form triangles (for those of us who aren't mathematically inclined, just think Epcot). It's not easy, but you can still find some geodesic domes designed to live in, like Keith and Fran did. They have to contend with the challenges of sloping walls, but they're happy living in their work of modern art and physics!

When we were kids, a treehouse was a wonderful haven, a safe escape and a great lookout. Should our adult homes serve the same purpose? Tereasa and David's friends built this house around the trunk of an old tree, making a grownup aerie in the woods.

A yurt is a round structure designed to be easily collapsed, like a tent. Originally the portable homes of nomadic peoples in the Asian steppe, it is now a popular type of semi-permanent structure in the West. With perfectly round walls, open ventilation at the top and no indoor plumbing, it may not be for everyone. But is it for you?

While some of these unusual home types suggest some degree of isolation, houseboat-dwellers are typically part of a tight-knit community, sharing the harbor and a culture that seems romantic and free to a landlubber. And while many houseboats are small, some of them are downright luxurious, like Sue's Simply Stunning Houseboat, in Seattle. Would you ever leave terra firm and live here?